Originally Posted by K2Grey
Technically, assuming a velocity of zero I think all physical objects have a total energy that is dependent primarily on mass. There might be some variations in the actual total energy, but for the most part the mass to energy conversion has to make up for it.
you're neglecting chemical energy, and the assumtion of velocity being zero is meaningless if you are comparing the nuclear energy which would be so large it would make any other energy insignificant.
Originally Posted by Cry Havoc
That is dependent upon the specifications of her car. Most
bone stock cars will not see a performance difference between 87-93 grade fuel.
However, in higher compression engines, there will be a difference. So if her Civic is modded out, then she is correct. If it isn't, neither of you are, really.
My car has a large V-8, and there is a small but noticeable difference when a higher octane fuel is used, especially if it's given octane boost additives.
correct. octane is the rating to the resistance of the fuel to knocking. hence the only way for 93 grade to produce more power is if your engine compression is high due to modification, and you require high octane to prevent knocking. The loss of power from lower octane is the cars antiknock sensors being tripped and retarding the timing on the engine to prevent knock, and therefore causing power loss. However at this stage of modification you probably know a bit about compression ratio already and what is the correct octane for your car, and therefore would not make such vague claims.